A blood test is a laboratory analysis performed on a blood sample that is usually extracted from a vein in the arm using a needle, or via fingerprick. Multiple tests for specific blood components (such as a glucose test or a cholesterol test) are often grouped together into one test panel called a blood panel or blood work.
Upper Air Troughs. When the height contours bend strongly to the south, (as in the diagram below), it is called a TROUGH. Strong troughs are typically preceded by stormy weather and colder air at the surface. Here is an example of a trough in an upper-level height field (red contours).
In a healthy heart, oxygen-rich blood moves from your lungs to the left upper chamber of your heart. The upper chambers are called your atria. Your atria pump the blood into the two lower chambers of your heart, known as your ventricles. Blood from your lungs is pumped from the left atrium into the left ventricle. The left ventricle pumps your blood around your body and back to the right atrium, the right ventricle, and then your lungs.